Same Frequency Detection Circuit of Low Frequency and Small Drift Polarity Converting Type

Published:2011/8/25 22:48:00 Author:Michel | Keyword: Same Frequency, Detection Circuit | From:SeekIC

Circuit's Functions The synchronous detection circuit with reverse phase or same phase whose work frquency is lower than dozens of HZand theycan be adpoted in the whole low frequency band.The circuit's analog switch uses the general N channel J-an FET. Smooth circuit adds12DB/OCT low-pass filter,which shortens the response time.It is easy to eliminate higher harmonic because the detection uses total wave rectifier system.This circuit is widely used in the lock-in amplifier detection circuit of measuring tiny voltage. Circuit's Work Principle OP amplifier A1 is impedance buffer ,A1 can be removed if the former stage's output impedance is as low as OP amplifier.



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